AI rendition based on witness descriptions, not an actual photo.
Flooded forest along the Likouala-aux-Herbes River, Republic of the Congo, the region where sightings are reported · JosepMGracia · CC BY-SA 4.0 (via Wikimedia Commons) · Image source · License
A creature with 'planks' on its back reported at the Likouala River.
FolkloreVerdict: We treat Mbielu-mbielu-mbielu as folklore: the record is stories and local reports, with no specimen or verified photo.